[quality] add unit tests for sitemap.ts, proxy.ts, robots.ts (0% -> covered)

[hivecommons-hive]

Test Improvement

Adds 17 unit tests for three previously-untested (0% coverage) route-level modules:

• src/__tests__/sitemap.test.ts (8 tests) — exercises src/app/sitemap.ts against a temp fixture tree via a process.cwd() spy: homepage//en//docs entries, per-tier priorities (1.0/0.8/0.9/0.7) and change frequencies, project root entries for all 7 projects, extension stripping and /index collapsing, exclusion rules (_-prefixed files/dirs, hidden dirs, node_modules, common-subs, images, non-markdown), file-mtime lastModified, and missing-content-root fallback.
• src/__tests__/proxy.test.ts (7 tests) — exercises src/proxy.ts with mocked next/server and next-intl/middleware: 307 redirects for /es/docs/*, /pt-BR/docs/*, /SC/docs/*, root→/docs, delegation to the i18n middleware for other paths, non-locale prefixes left alone, and matcher config shape.
• src/__tests__/robots.test.ts (2 tests) — src/app/robots.ts rules and sitemap URL.

No production code changed. Full suite: 58 files / 530 tests pass; npm run lint 0 errors; tsc --noEmit clean.

Related Issue

Closes #52

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Filed by quality agent (hold-gated mode). Human review required.

— hive: agent=quality backend=copilot model=claude-fable-5 copilot=1.0.88

[hivecommons-hive]

Important

Held for human review by the hive's ACMM level gate.

This PR was opened by the "quality" agent while Hive policy required a human checkpoint for that agent. Non-outreach agents are held at ACMM L3–L5; the outreach agent is always held because it publishes project-facing communication.

Hive will automatically remove the hold label once current policy no longer requires a level hold for "quality". If this is an outreach PR, a human must review it and remove the label.

[kubestellar-prow]

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[kubestellar-prow]

PR needs rebase.

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[clubanderson]

Closing as superseded by #55, which merged the non-redundant route coverage from this PR on top of the current docs main branch. The rest of this PR's sitemap/proxy/robots coverage was already covered by #54.